android-在不使用getActivity()的情况下实现两个片段之间的ViewModel

public class SharedViewModel extends ViewModel {
    private MutableLiveData<String> data = new MutableLiveData<>();

    public void setData(String newData) {
        data.setValue(newData);
    }

    public LiveData<String> getData() {
        return data;
    }
}

public class FragmentA extends Fragment {
    private SharedViewModel sharedViewModel;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sharedViewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class);
    }

    // 使用sharedViewModel来设置或获取数据
}

public class FragmentB extends Fragment {
    private SharedViewModel sharedViewModel;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        sharedViewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class);
    }

    // 使用sharedViewModel来设置或获取数据
}

sharedViewModel.getData().observe(this, new Observer<String>() {
    @Override
    public void onChanged(String newData) {
        // 处理数据变化
    }
});